MErge mainline into intwrap

grub-core/kern/handler.c

@@ -0,0 +1,64 @@
+/* handler.c - grub handler function */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/handler.h>
+
+grub_handler_class_t grub_handler_class_list;
+
+void
+grub_handler_register (grub_handler_class_t class, grub_handler_t handler)
+{
+  int first_handler = (class->handler_list == 0);
+
+  grub_list_push (GRUB_AS_LIST_P (&class->handler_list),
+		  GRUB_AS_LIST (handler));
+
+  if (first_handler)
+    {
+      grub_list_push (GRUB_AS_LIST_P (&grub_handler_class_list),
+		      GRUB_AS_LIST (class));
+      grub_handler_set_current (class, handler);
+    }
+}
+
+void
+grub_handler_unregister (grub_handler_class_t class, grub_handler_t handler)
+{
+  grub_list_remove (GRUB_AS_LIST_P (&class->handler_list),
+		    GRUB_AS_LIST (handler));
+
+  if (class->handler_list == 0)
+    grub_list_remove (GRUB_AS_LIST_P (&grub_handler_class_list),
+		      GRUB_AS_LIST (class));
+}
+
+grub_err_t
+grub_handler_set_current (grub_handler_class_t class, grub_handler_t handler)
+{
+  if (class->cur_handler && class->cur_handler->fini)
+    if ((class->cur_handler->fini) () != GRUB_ERR_NONE)
+      return grub_errno;
+
+  if (handler->init)
+    if ((handler->init) () != GRUB_ERR_NONE)
+      return grub_errno;
+
+  class->cur_handler = handler;
+  return GRUB_ERR_NONE;
+}